Conditional probability

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What does P(A|B) mean?

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The probability that A occurs given that B has already happened

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What is the conditional probability formula (multiplication law for dependent events)

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P(AnB)= P(A) x P(B|A)

P(AnB) = P(B) x P(A|B)

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6 Terms

1
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What does P(A|B) mean?

The probability that A occurs given that B has already happened

2
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What is the conditional probability formula (multiplication law for dependent events)

P(AnB)= P(A) x P(B|A)

P(AnB) = P(B) x P(A|B)

3
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P(AnB’) for conditional probability

P(AnB’)= P(A) x P(B’|A)

4
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P(A’nB) for conditional probability

P(A’nB) = P(A’) x P(B|A’)

5
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P(A’nB’) for conditional probability

P(A’nB’)= P(A’) x P(B’|A’)

6
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Laws for independent events

  • P(AnB)= P(A) x P(B)

  • P(A) + P(B) - P(AuB)